Lamp harp



Patented Oct. 7, 1941 UNITED STATES PATENT OFFICE Kernel Berger, Brooklyn, N. Y.

Application November 19, 1940, Serial No. 366,239

1 Claim.

The invention here disclosed relates to lamp constructions and particularly to structure of the shade supporting frame or harp.

Objects of the invention are to provide simple, inexpensive means to lock the several parts of the lamp construction together in their proper prearranged order, which will accomplish this looking or securing of the parts automatically by the mere act of assembly and which will effect these results without requiring additional parts or taking up additional space or affecting what may be the ornamental arrangement of parts constituting the lamp.

' Other desirable objects and the novel features 1 of invention by which all objects are attained will appear and are set forth in the course of the following specification.

The drawing accompanying and forming part of the specification illustrates certain embodiments of the invention. Structure however may be modified and changed as regards such illustration, all within the true intent and broad scope of the invention as Will be apparent from the following specification and claim.

Fig. 1 is a part sectional front View of a lamp constructed in accordance with and embodying features of the invention.

Fig. 2 is a part sectional side View, showing the lamp shade tilted on the harp frame.

Fig. 3 is an enlarged broken sectional detail as on substantially the plane of line 3-3 of Fig. 2.

Fig. 4: is a plan of the base of the harp with the wire forming the sides of the harp frame indicated in section.

Fig. 5 is a cross-sectional detail as on line 55 of Fig. 4.

Figs. 6 and '7 are views similar to Figs. 4 and 5 of a modified form of harp base, Fig. '7 being taken on line 'l'! of Fig. 6.

Figs. 8 and 9 are views similar to Figs. 4 and 5 of another modification, Fig. 9 being taken on line 99 of Fig. 8.

Fig. 10 is a broken plan of a further modified form of harp base.

Fig. 11 is a broken sectional detail illustrative of another embodiment of the invention.

In the general views, Figs. 1 and 2, there is shown a lamp of typical construction, involving a switch socket i5, and a lamp pedestal or body It, having a supporting base l1, held together by a length of pipe l8, extending up through all these parts, having an abutment flange l9, at the lower end and screw connection With the cap 20, of the socket at the 30p.

The shade frame 2| is shown carried by the fixture 22, swivelled on the wire frame portion 23, of the harp.

The base of the harp is shown in the form of an annular washer 24, of sheet metal having oppositely projecting arms 25, curled about the ends ofthe doubled loop of wire.

The washer-like form of the base enables the harp to be mounted by engagement of such base over the pipe, in between the top of the pedestal andthe screw cap of a' socket. The present in vention'involves the provision of the harp base with means for interlocking with and preventing relative turning of the parts.

In the first illustrated form of the invention, Figs. 1 to 5, the means for securing and locking the parts against relative rotation consist of upwardly projecting pointed spurs 26, at the inner edge of the washer-like base,- to bite into the end of the socket cap and downwardly projecting spurs or lugs 21, at the rim of such base to interlock with the lamp pedestal It, or immediately underlying part of the lamp structure.

Fig. 3 shows how, if desired, the interlock between the harp and lamp pedestal may be effected through an intermediate washer 28, having sharpened spurs 29, to bite into the top of the pedestal. This combination may be desirable where the lamp pedestal is of pottery, glass or other hard materials, that it might be difficult for the downwardly inclined spurs of the harp base to interlock with. Ordinarily however, this interposed washer with the special sharply pointed spurs may not be necessary, the spurs on the harp base being suflicient of themselves to securely lock the harp, lamp socket and lamp pedestal together in the desired prearranged relation.

In the illustration, the body or pedestal of the lamp is in the nature of a vase having oppositely projecting ornamental arms or handles 30. To preserve symmetry of relation and to make the lamp appear to best advantage when the shade is tilted, as in Fig. 2, the harp should stand in line with such projecting ornamental handles.

Further, the socket should be so positioned that the push button, key or other actuator 3|, for the switch will stand at such an angle to the harp that it may always :be readily grasped in the fingers.

The harp base, by interlocking with the lamp socket at one side, with the lamp pedestal at the opposite side and being in turn interlocked with both, serves then by the mere act of assemblage to fixedly secure all three of these parts in their desired prearrang d ord r. such as for instance,

in the particular relation illustrated and described.

Figs. 6 and '7 illustrate a modification of the invention in which the washer-like base of the harp is provided at the inner diameter of the same with both upwardlyand downwardly struck spurs or projections 32, 33, to interlock with the socket cap above and the pedestal or lamp base part below the same.

Figs. 8 and 9 illustrate a simple form, in which the harp base is merely provided with upwardly projecting points or spurs 34, about the inner diameter to bite into the bottom of the lamp so'cket.

Fig. 10 illustrates a simple form of the inveninterlock maybe frictionaL-or partly both types.

In Fig. 11, a frictional form of interlock is provided by constructing the washer base of the harp with a downwardly contracted bevel socket 36,

about the central opening to wedgingly receive the lower generally cylindrical screw hub portion 20, of the socket cap. By 'form'ing this socket with only a slight bevel, a firm and lasting form of interlock maybe effected between the socket an'olharpand the pressure therebyapplied to the pedestal be sufficient usually to maintain all three of the parts firmly interlocked in a friction'al sense. If desired, a friction washer may b'einterpose'dbetween the harp base and top of the pedestal or spurs be struck down from the rim of the harp baseas indicated at 31. The frictional socket 36, may be formed by integral upstruck portions of the sheet metal harp base, as indicated and these, if separated by slots at -38, may act with a certain spring tendency to increase the frictional hold of the parts.

' In all forms of the invention, the parts may be locked up in the desired prearranged order, by

, simply turning the screw cap firmly down over the harp base. This may be done either before or after the socket is wired. The desirable practice-may-be'to first screw the cap down alone to its fully interlocked condition on the pipe over the harp base and to then, after such parts are set up firmly, to connect and mount the switch and attach the shell to the cap of the socket with the switch button located in the desired relation in the harp.

In Fig. 3 and in other views, the teeth of the harp base are shown as bent at a considerable and possibly somewhat exaggerated angle. In actual practice, the teeth may stand at a relatively slight angle and in fact in some instances, may be in the same flat plane of the harp base, since the tightening of the parts will impress them to a sufficient extent for interlocking purposes into the relatively soft brass of the socket cap. And even when the teeth are angled with respect to the base as shown in Fig. 3, in the final position, such teeth will be flattened down substantially flush with the plane of the harp base. While various ways of providing interlocking teeth or spurs are illustrated, it will be understood that practically any'form of roughened surface or surfaces on the harp base will suffice to provide the necessary interlock when the parts are tightly connected.

What is claimed is:

A lamp construction as disclosed, in which a lamp socket, lamp base and shade supporting harp are rotatably adjustable independently of each other but can be each set in a desired angular relation and all three parts locked together in such selected positions and comprisingin combination, a lamp body, a lamp socket in rotatively adjustable relation on said lamp body, a screw connection extending up through said lamp body 1 and lamp socket for clamping said socket down on said lamp body and a lamp shade supporting harp comprising a harp base and a harp frame carried thereby, said harp'base being interposed between said lamp body and socket and having anopening therethrough of larger size than said screw connection, whereby said harp may be turned independently of said screw connection and independently of both the lamp body and socket and inwardly projecting substantially radially disposed teeth at the edge of said large size opening in said harp base, said teeth having upwardly angled sharp edges to efiect an interlock with said socket when said screw connection is tightened and whereby the base of the harp and the socket in such interlocked relation will be then held clamped by said screw connection down in desired angular relation on the base.

KORNEL BERGER. 

